Captive Bezel

Outer bezel with a special design to prevent it from being lost.

Bezels are conventionally attached to the body of the case using a snap-in mechanism. If knocked, the ring can, in the worst case, become detached and the set time lost. Many SINN watches are therefore fitted with a safety system which overcomes this design weakness.

Ar-Dehumidifying Technology – enhanced freedom from fogging

Ar-Dehumidifying Technology solves a basic problem of mechanical watches: the aging of oils due to moisture in the air contained inside, or diffusing into, the watch. The movement is mounted in a nearly anhydrous atmosphere thanks to the three Ar-Dehumidifying Technology elements of drying capsule, EDR seals (Extreme Diffusion-Reducing) and protective gas filling. Aging processes and fogging of the crystal from sudden cold are prevented, and reliable functioning and accuracy are ensured.

A three-year warranty is offered on all watches featuring Ar-Dehumidifying Technology.

The titanium drying capsule. As with crowns and push-pieces, we use EDR seals here, too.

All seals are made of dealing materials that are extremly difussion reducing (EDR).

The Ar-symbol on the dial, here the 103 Ti DIAPAL, indicates models with Ar-Dehumidifying Technology

Magnetic Field Protection – long-term accuracy

Magnetic fields such as those of electric motors, loudspeakers or door closers cause the Nivarox balance spring to become magnetised and adversely affect the accuracy of the watch. We solve this problem by using a protective sheath consisting of a closed, magnetically soft inner case that includes the dial, the movement holding ring and the case back. This Magnetic Field Protection minimises magnetic interference.

This SINN trademark identifies watches featuring Magnetic Field Protection of up to 80,000 A/m.

Magnetic field protection from SINN: A soft iron cage

This Sinn trademark portrays stylised magnetic field lines and a magnetic core.


 -Technology - Shielding of electromagnetic pulses

Electromagnetic radiation

In analogue quartz movements, the gear train is driven by a so-called stepper motor. Rather than turning continuously, this little electronic motor only rotates every second by a certain angle and generates an electromagnetic pulse.

Shielding measures

In models featuring the Q symbol on the dial, the electromagnetic radiation (pulse) emitted by the movement is minimised. The quartz movement has a special alloy sheath which is designed to absorb the exact frequency of the movement radiation. The radiation emitted by the movement is ‘trapped’ in the case, preventing it from escaping.

Effects on humans

The effects of electromagnetism on humans is the subject of various analyses of the impact of electromagnetic radiation on the environment. Here, the focus is on the effect of electronic devices – particularly on public health. Unlike many household devices, quartz watches emit weak electromagnetic radiation. Since some people are highly sensitive to such radiation and a watch is worn directly on the body for an extended period of time, we offer shielding.

Every jump second of a quartz watch radiates an electromagnetic pulse. A control current starts flowing through the motor coil, causing the motor to rotate and generate an induced current. The graph shows exclusively magnetic components for a typical stepper “cardiogram”.

TEGIMENT – greatly increased scratch – resistance thanks to surface hardening

TEGIMENT Technology raises the hardness level of the base material, e.g. stainless steel, by a significant factor. The technology was first introduced in the 756 Duochronograph at the International Baselworld Watch and Jewellery Show in Basel in 2003, replacing the ice hardening technique for nickel-free watch cases first presented in 2002. Originally TEGIMENT Technology was only used on stainless steel cases. The term is now used to refer to all materials with a hardened surface.

TEGIMENT Technology provides highly effective protection against scratches. The method is not, however, based on the application of a coating. Instead it is the surface of the material itself which is hardened by means of a special process, thereby creating a protective layer (“tegimentum” in Latin). The surface of any watch hardened using TEGIMENT Technology has a significantly greater level of protection against scratches than that afforded by the hardness of the base material.

Black Hard Coating – high quality coating in combination with TEGIMENT Technology

Sinn Spezialuhren only uses hard coatings (known as PVD coatings) with TEGIMENT surfaces. Because only in this combination is it possible to achieve the high quality of our PVD paint coatings. The TEGIMENT hardness profile is continuous. In other words, the high level of surface hardness transitions very gradually to the basic hardness of the material. This makes it possible for a PVD paint coating to be applied without risking the otherwise familiar peeling effect of the paint from the body of the case.

This means that paint coatings applied using what is known as the PVD technique are exceptionally hard. The great and sudden difference in hardness between the hard paint coating and base material means these tend to crack when under stress because the hard shell (PVD paint coating) is applied seamlessly to a very soft core (case material). When suddenly subjected to stress, the base material yields and cannot support the outer layer sufficiently. This is called the ‘eggshell effect’. The hardness of the TEGIMENT surface, by contrast, supports the hard coating. This prevents the eggshell effect and dramatically reduces flaking of the paint coating.

Although the paint coating applied using the PVD technique is extraordinarily hard, it may become damaged on contact with harder materials. This corresponds to the latest technological standards and is therefore unavoidable. The problem is that unlike a solid-coloured material, a paint coating always remains vulnerable under certain conditions.

Temperature Resistance Technology – functionally reliable at temperatures from − 45 °C up to + 80 °C

The long-term accuracy of a watch movement crucially depends on the lubrication of its moving parts – this is particularly true at extreme temperatures. Sinn Spezialuhren uses the special oil to ensure reliable function under even the most extreme conditions. With its outstanding properties, it provides lubrication that is highly resistant to aging at temperatures between – 45 °C and + 80 °C.

Lubrication with SINN Special Oil is essential for a SINN watch capable of withstanding this extreme spectrum of temperatures. Lubrication alone, however, is not sufficient.  Just as important are the expansion and contraction rates of the movement´s individual components. Sinn Spezialuhren counteracts this negative effect by testing each individual watch in a temperature chamber. Each and every watch must meet our strict quality standards even at extreme temperatures.


Print Print | Sitemap
© TWR Watch Repairs 2019